Speaker
Description
Correlated electron systems display electronically ordered ground states often intrinsically segregated at the nano/mesoscale. Antiferromagnetic order is a common instability of these materials potentially showing spatial inhomogeneity. I will present our recent result using a resonant soft X-ray scattering nanoprobe to image the bulk magnetic landscape in NdNiO3 thin films. Our measurements provide direct evidence for a highly textured magnetic fabric, that further exhibits return memory effects across the Neel transition. The scale-free distribution of antiferromagnetic domains and its non-integral dimensionality, together reveal a magnetic fractal geometry near criticality, which reflects the interplay between electronic correlations and an intrinsic local parameter. Our observations expose new essential details of the nanoscale structure of nickelates.